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Siemens 3RT1916-2EC31 — Contactors

Siemens 3RT1916-2EC31 SIRIUS Auxiliary Switch, ON-Delay 5-10

MPN3RT1916-2EC31

Siemens SIRIUS auxiliary switch, 3RT1916-2EC31, adjustable ON-delay 5-100 s, 1 A at 24 V, 45 mm width, clip-on mounting, IP20.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RT1916-2EC31 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz100 ... 127 V
3RT1916-2EC31 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusefuse gL/gG: 4 A
3RT1916-2EC31 — Connection & Mounting
ParameterValue
Conductor cross-section, solid18 ... 14
Conductor cross-section, finely stranded w/ ferrule0.5 ... 2.5 m²
3RT1916-2EC31 — Environmental
ParameterValue
Operating temperature range15 ... 95 %
3RT1916-2EC31 — Mechanical
ParameterValue
Width45 mm
Height38 mm
Depth75 mm

Product details

The ON-delay range of 5 to 100 s covers common sequencing tasks — stagger-starting multiple motors, delaying a secondary conveyor, or holding a brake release until the drive has ramped. Recovery time is 150 ms, so the timer resets fast enough for repeated start-stop cycles. The coil pulls in at 85 % of rated voltage (initial value 0.85) and operates on 100-127 V at 50/60 Hz, which matches standard control transformers in North American and European panels.

Clip-on mounting to the contactor base — no tools, no extra DIN-rail space. Any mounting position is permitted, so horizontal or vertical panel layouts work. The stranded wire range of 18-14 AWG covers typical control wiring; the solid range is the same. Basic insulation (type per IEC) means it is isolated for functional separation within the panel, not for direct line-voltage isolation.

Designed to EN 61000-6-2. Basic insulation rating and pollution degree 3. RoHS and REACH compliance documentation available from Siemens; CE marking for European market.

Frequently asked questions

What is the adjustable time range on this auxiliary switch?

The ON-delay is adjustable from 5 to 100 seconds via the front-panel dial. Recovery time between cycles is 150 ms.

Will the 3RT1916-2EC31 drop into a panel designed for the 3RT1016-1BB42?

Both are SIRIUS auxiliary switches with the same 45 mm width and clip-on mounting, so they share the same DIN-rail footprint and mechanical interface to the contactor base. The difference is function: the 3RT1916-2EC31 is an adjustable ON-delay timer, while the 3RT1016-1BB42 is a standard instantaneous auxiliary contact block. If the panel wiring expects a timed make-contact, the 3RT1916-2EC31 is a direct fit; if the circuit needs an instantaneous N/O or N/C contact, the 3RT1016-1BB42 is the correct choice.

MPN
3RT1916-2EC31